<template>
  <view>
  <!-- 购物车标题区域 -->
  <view class="cart-container" v-if="cart.length!==0">
    <my-address></my-address>
    <view class="cart-title">
      <uni-icons type="shop" size="18"></uni-icons>
      <text class="cart-title-text">购物车</text>
    </view>
    <!-- 滑动删除 -->
    <uni-swipe-action>
      <block v-for="goods,i in cart" :key='i'>
        <uni-swipe-action-item :right-options="options"  @click="swiperItemHandler(goods)">
          <my-goods :goods="goods" :showRadio="true" @radio-change='radioChangeHandler' :showNumberBox='true'
            @num-change="numbarChangeHandler"></my-goods>
        </uni-swipe-action-item>
      </block>
    </uni-swipe-action>
    <my-settle></my-settle>
  </view>
  <!-- 空白购物区展示页面 -->
  <view class="empty-cart" v-else>
    <image src="/static/cart_empty@2x.png" class="empty-img"></image>
    <text class="tip-text">空空如也~~</text>
  </view>
  
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  // 按需导入 mapState 这个辅助函数
  import {
    mapState,
    mapMutations
  } from 'vuex'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        options: [{
          text: '删除',
          style: {
            backgroundColor: '#C00000'
          }
        }]
      };
    },
    computed: {
      ...mapState('m_cart', ['cart'])
    },
    methods: {
      ...mapMutations('m_cart', ['updateGoodsState', 'updateGoodsCount','removeGoodsById']),
      //商品的勾选状态发生了变化
      radioChangeHandler(e) {
        //console.log(e) // 输出得到的数据 -> {goods_id: 395, goods_state: false}
        this.updateGoodsState(e)
      },
      //购物车商品数量发生改变时触发
      numbarChangeHandler(e) {
        // console.log(e) 
        this.updateGoodsCount(e)
      },
      swiperItemHandler(goods){
        // console.log(goods)
        this.removeGoodsById(goods.goods_id)
        uni.$showMsg('删除商品成功!')
      }
    }
  }
</script>

<style lang="scss" scoped>
  .cart-container{
    padding-bottom: 50px;
  }
  .cart-title {
    height: 40px;
    display: flex;
    align-items: center;
    padding-left: 5px;
    border-bottom: 1px solid #efefef;

    .cart-title-text {
      font-size: 14px;
      margin-left: 10px;
    }
  }
  .empty-cart{
    padding-top: 150px;
    display: flex;
    flex-direction: column;
    align-items: center;
    .empty-img{
      width: 90px;
      height: 90px;
    }
    .tip-text{
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
</style>
